可以描述同时执行的操作序列。
You can describe sequences of actions that execute at the same time.
曼德拉先生从未读过这本书，也没有为这本书作序。
Mr Mandela has neither read the book nor written a foreword for it.
Input每行是一个测试用例，表示一个操作序列。
曼德拉基金会表示：“要曼德拉先生为书作序的请求多得让他喘不过气来。”
"Mr Mandela is still overwhelmed by requests to write book forewords," his foundation said.
曼德拉基金会表示：“要曼德拉先生为书作序的请求多得让他喘不过气来。”
"Mr Mandela is still overwhelmed by requests to write book forewords," his foundation said.
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